10 GBit questions

rvdbijl

I'm running on a 2-core Core i7-2655LE @ 2.2GHz. It's been serving me well at 1 GBit. But now my ISP has upgraded to 2 GBit, and with that, I swapped out the i350 Quad board I had in this system for an i540-T2 10Gbit adapter.
I moved all my local VLANs to one of the ports (going to a 10Gbit smart switch) and the other port on the board is a WAN port.
With a PC connected on one of the other 10 GBit ports on the switch, I get 1.1 GBit max throughput through WAN (Speedtest with an ISP hosted server).

Testing with iperf3 between that PC and the router yields some interesting results:
Server on the router: Max 1.25Gbit throughput, CPU utilization on both cores spikes to 40% or so while the test is running (60% idle).
Server on the PC: Max 5.6 Gbit throughput, CPU utilization on both cores around 10%.

I did hook up another PC (but don't have a 10Gbit board, just a 2.5 Gbit), and I'm getting the full 2.5 Gbit between those systems in iperf3 in both directions, as well as when copying large files between those PCs. So I don't think the router or the two PC's have settings that could be causing issues.

I did try to run two simultaneous speedtests from two PC's, and in that case I see (on the router) the traffic spike to 1.4 Gbit (700-ish on both PCs), but no higher than that in either direction.

Question for the group -- is this CPU/system just not capable of running > 1.25/1.4 GBit? Or is there some other optimization or setting that could be causing issues here?

stephenw10

That's not an especially fast CPU but I'd expect more than that through it. Testing to or from it directly is always going to give a lesser result.
How are you measuring the CPU usage? I would use top -HaSP at the CLI.

Check Status > Interfaces for errors on the NICs.

Steve

rvdbijl

@stephenw10 I was running the Diagnostics - System Activity which I think is the same output? Either way, the test ran long enough for me to see the CPU usage change.

WAN interface has 5/0 errors and LAN has 0/184 errors. I assume that's cumulative since I rebooted last (about a week ago), so I'm assuming that's probably not the issue. Cables from the router to the switch are 2 feet long and CAT8 (shielded). But I have been plugging and unplugging them so it wouldn't surprise me if those errors were accumulated then. I did not see any movement on those counters in the last few minutes (even when running speedtests).

Started looking on eBay for some faster systems.. The Xeon D2123IT (SYS-5019D-4C-FN8TP) looks like a decent option (without a humongous power draw)...

Dobby_

@rvdbijl said in 10 GBit questions:

The Xeon D2123IT (SYS-5019D-4C-FN8TP)

If you have the chance to get hands on a device ending with an "N" or "NT" it is standing for network you may be better sorted with that. It is because you can count on that that
devices are sorted with "all 4 options".

TurboBoost
Hyperthread
Intel QAT
AES-NI

Pleas have a look at something like

Intel Xeon D-21xxNT
or
Intel Xeon D-27xxN

rvdbijl

Looks like those *NT options add quite a bit to the cost ... At least, that I've found. Also to TDP (which I guess makes sense).

It looks like the 2123IT has everything except QAT, which isn't implemented in CE 2.6.0 (which I run). So it doesn't sound like I should expect a big change between an *IT and *NT CPU, right?

tman222

Hi @rvdbijl - what are the rest of the specs of your current system? The i7-2655LE is fairly old (released in 2011) so I'm a little concerned that the issue might be insufficient PCI Express bandwidth due to an older motherboard.

Having said that, some of the older Intel Xeon D-15xx family should be able to able to pass 2Gbit/s as well (if you're looking for something cheaper and/or used). I have run pfSense on a Supermicro 5018D-FN8T box for a number of years now and it can achieve 6-7 Gbit/s LAN1 to LAN2 (though the firewall) when running an iperf3 test. Real world performance (which would include smaller packets) is likely a bit less, but 3-4 Gbit/s, if not better, should still be achievable. Keep in mind that 10Gbit/s may require some hardware tuning as well.

If you're looking for something newer and closer to cutting edge, this Xeon D-1718T based Supermicro box looks nice from a price/performance standpoint:

https://www.supermicro.com/en/products/system/iot/1u/sys-510d-4c-fn6p

The hardware is pretty recent though and likely will require at least pfSense 2.7 / pfSense Plus 23.01 for full support.

Hope this helps.

rvdbijl

@tman222 It's an old embedded system (Advantech Uno) with a PCIe x8 slot that the network board is mounted in. I got it for free a few years ago, and it was a good upgrade for my old Atom-based pfSense box when my network was 500MBit/50MBit and it was straining to keep up, especially with OpenVPN.
Then I switched ISPs to 1G/1G, and it still kept up, seemingly with no issue (note that I do not run snort, or any other packages that could slow things down -- just firewall and some OpenVPN, DHCP and DNS). Now I'm at 2G/2G and I'm only seeing 1.1G of that with the Uno box (using Speedtest).

I don't think it's constrained on its PCIe bus - it claims to be connected to the board at 8x link, etc. Also -- I can pump data TO it at 5-6 GBit/s based on iperf3. Just FROM it seems to be limited to 1.2 GBit/s (with iperf3).

Either way -- I don't want to drop a ton of money on a new system ($500-$800 would be my limit), so the Xeon D-1718T is a bit out of my price range. I did just buy an older Dell R210-II with Xeon E3-1275 v2 on it off eBay for a little under $300, shipped. When that arrives, I'll give it a try. I know it's going to consume more power than my current system, but I can't justify >$1000 right now. If the Dell fails in getting me the full 2 GBit bandwidth (with some margin), I'll look for a faster system.

tman222

@rvdbijl - that Dell R210-II system should be more than capable based on the CPU specs I can see. Also, I agree with you that it sounds like there is enough PCI Express bandwidth with the x8 slot on your current syste.

There may be another performance limitation / some network tuning required to try to overcome the current limit you're seeing. A couple good links to check out:

https://calomel.org/freebsd_network_tuning.html
https://wiki.freebsd.org/NetworkPerformanceTuning
https://docs.netgate.com/pfsense/en/latest/hardware/tune.html

Hope this helps.

Dobby_

@rvdbijl said in 10 GBit questions:

Looks like those *NT options add quite a bit to the cost ...

If you can get your hands on a used hardware, and there
will be two choices! One with IT and one with N or NT
and they are nearly the same price range, let us say at
something around $500 ish, my tip was to go with the
N or NT named boards (CPUs) over the IT named ones.

At least, that I've found. Also to TDP (which I guess
makes sense).

If this will be even more important to many of us, you
could also play with the idea to get hands on a small
Intel Denverton (C3000) hardware. 4 cores are enough
for your 1 GBit/s internet line if you are not using PPPoE.
Board ~389 plus shipping fee
case

Perhaps on top of this will be coming then if needed;

RAM 2x DDR4 2400MHz
M.2 SSD
2.5 GBit/s NIC

It looks like the 2123IT has everything except QAT, which isn't implemented in CE 2.6.0 (which I run). So it doesn't sound like I should expect a big change between an *IT and *NT CPU, right?

With pfSense CE you may be also able to use QAT but
not able to set it up so easy like with pfSense+ Plus.

The N or NT is giving you the full "potential" of the mostly
wished or "needed" points, but this is all different from user to user!

QAT
AES-NI
TurboBoost
HT
Support DPDK

Mostly or often this may be the main points all are
talking about.

stephenw10

You should make sure the 10G NICs show the expeced number of queues when they attach at boot. Especially since you're seeing traffic limited in one direction.

rvdbijl

@stephenw10 said in 10 GBit questions:

You should make sure the 10G NICs show the expeced number of queues when they attach at boot. Especially since you're seeing traffic limited in one direction.

It looks like 2 queues are being allocated for both ix0/ix1 interfaces. Not sure if that's what it's supposed to be:

ix1: netmap queues/slots: TX 2/2048, RX 2/2048
ix1: eTrack 0x80000528 PHY FW V286
ix1: PCI Express Bus: Speed 5.0GT/s Width x8
ix1: Ethernet address: 80:61:5f:0e:8c:25
ix1: allocated for 2 rx queues
ix1: allocated for 2 queues
ix1: Using MSI-X interrupts with 3 vectors
ix1: Using 2 RX queues 2 TX queues
ix1: Using 2048 TX descriptors and 2048 RX descriptors
ix1: <Intel(R) X540-AT2> mem 0xf0000000-0xf01fffff,0xf0400000-0xf0403fff irq 18 at device 0.1 on pci2
ix0: netmap queues/slots: TX 2/2048, RX 2/2048
ix0: eTrack 0x80000528 PHY FW V286
ix0: PCI Express Bus: Speed 5.0GT/s Width x8
ix0: Ethernet address: 80:61:5f:0e:8c:24
ix0: allocated for 2 rx queues
ix0: allocated for 2 queues
ix0: Using MSI-X interrupts with 3 vectors
ix0: Using 2 RX queues 2 TX queues
ix0: Using 2048 TX descriptors and 2048 RX descriptors
ix0: <Intel(R) X540-AT2> mem 0xf0200000-0xf03fffff,0xf0404000-0xf0407fff irq 17 at device 0.0 on pci2

stephenw10

Yeah, that's probably correct Though that CPU looks like it's 2-cores with 2-threads per core so 4 virtual cores., if hyper-threading is enabled. If it shows 4 CPUs I'd expect 4 queues.

It's the same number of queues for Tx and Rx though so that doesn't look like a problem.

rvdbijl

@stephenw10 said in 10 GBit questions:

Yeah, that's probably correct Though that CPU looks like it's 2-cores with 2-threads per core so 4 virtual cores., if hyper-threading is enabled. If it shows 4 CPUs I'd expect 4 queues.

I was wondering about that myself -- I did turn Hyperthreading off to test to see if it got faster, but there was no appreciable difference. So I turned it back on. This is the log from the last boot and shows 2 queues, despite there being 4 cores (HT).

It's the same number of queues for Tx and Rx though so that doesn't look like a problem.

So it sounds like there aren't many more avenues to optimize this box. For whatever reason it's just not able to handle > 1GBit. My new box should be here in a week or so. Hopefully that one will run a lot faster...

(I did go through the optimization articles that were mentioned earlier, but none of the tricks made it any faster. Some actually made it slower -- like turning off HW offload options).

Thanks all for the tips and suggestions!

Dobby_

@rvdbijl

The Xeon D2123IT

4 Cores
8 Threads

max 3.0GHz

TurboBoost
HyperThreading
AES-NI
DPDK?

4 from 5!

If you are not using the PPPoE it will saturate a 1 GBit/s
with ease. And in theoretic it should be then able to
feed or support 8 queues, but you can also "tune" the;

queue size
queue length
queue amount pending on the CPU "C/T"

perhaps you will be reporting back here if that box
was arriving.

rvdbijl

@dobby_
I ended up going with the Dell R210-II system with Xeon 1275v2 CPU. I'll be more than happy to report to this thread once I have some measurements with iperf3 / Speedtest!

SpaceBass

@tman222 said in 10 GBit questions:

Dell R210-II system should be more than capable

In my testing, the R2x series cannot move more than about 1.8-2Gbps ... the CPUs simply max out on single thread routing

Dobby_

@rvdbijl said in 10 GBit questions:

Dell R210-II system with Xeon 1275v2 CPU

3,5 - 3,9 GHZ
CPU 4C/8T
AES-NI
TurboBoost
Hyperthreading

May be also an interesting choice! If you will not forced
to use PPPoE it can be significant faster then imagine of.

rvdbijl

@spacebass said in 10 GBit questions:

@tman222 said in 10 GBit questions:

Dell R210-II system should be more than capable

In my testing, the R2x series cannot move more than about 1.8-2Gbps ... the CPUs simply max out on single thread routing

What CPU did you test with on the R210-ii?

SpaceBass

@rvdbijl 1270 v5

rvdbijl

@spacebass
The v5's work on the R210-ii? From what I read, it only supports up to the E3-12xx v2 series ...